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    Poor peformance after synthetic oil change-over

    Well I'll just put in my .02. I just switched my wife's Denali over to Mobil 1 full synthetic. The Oil life meter hit 0% today. Tomorrow I am changing the oil to Amsoil Signature Series 0W-30 for the winter, and probably forever. I am also using an Amsoil Ea filter. I will probably run the oil...
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    Cold Intake Questions?

    Down shifting will cost you more in the end than anything. Brakes are made for slowing/stopping, tranny is made for moving.When I drive my wife's Yukon Denali XL I can swing 17 mpg in town and on the highway with just coasting and keeping it at 65mph.
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